Synchronous positioning structure for height adjustment of supporting legs of bridge girder erection machine and height adjustment method

Abstract

The invention relates to the technical field of bridge girder erection machines, in particular to a synchronous positioning structure for bridge girder erection machine supporting leg height adjustment and a height adjustment method.The synchronous positioning structure comprises a bridge girder erection machine main cross beam, supporting leg sleeves are fixed to the two ends of the lower surface of the bridge girder erection machine main cross beam, and a movable pulley fixedly connected with the shielding frame is installed on the upper surface of the shielding frame; the wind-up roller is rotatably installed in the middle of an inner cavity of the bridge erecting machine main beam, a steel wire rope is wound around the outer side of the wind-up roller, and one end of the steel wire rope is fixedly connected with the bridge erecting machine main beam. The device has the beneficial effects that a winding roller is rotationally mounted in an inner cavity of a main cross beam of the bridge erecting machine, a steel wire rope is wound on the outer side of the winding roller, a shielding frame is slidably arranged on the outer side of a telescopic column, a movable pulley is fixed to the upper end of the shielding frame, and a first through hole and a second through hole are formed in the telescopic column and the shielding frame correspondingly; a worker can judge whether the lifting heights of the supporting legs on the two sides of the device are synchronous or not according to whether the two positioning bolts can penetrate through the two sets of first through holes and second through holes or not, and therefore the device is prevented from overturning.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge erecting machines, and particularly to a synchronous positioning structure and height adjustment method for adjusting the height of the legs of a bridge erecting machine. Background Art

[0002] A bridge erecting machine is a large-scale construction machinery and equipment specifically used to lift prefabricated bridge girders (such as box girders and T-shaped girders) and accurately place them on pier bearings. During the operation of the bridge erecting machine, it is necessary to adjust the height of its legs.

[0003] In the prior art, the Chinese invention with the publication number CN104727228B discloses a telescopic leg device for a tunnel bridge erecting machine. During its use, there is no need to consider the standing position problem after disassembling and telescoping the legs. Therefore, the telescopic legs have the characteristics of fast operation and stable operation, effectively improving the working efficiency and comprehensive utilization rate of the bridge erecting machine.

[0004] However, currently, during the process of adjusting the lifting height of the legs on both sides of the bridge erecting machine, it is difficult to keep the lifting heights of the legs synchronized, resulting in the overall tilt and eccentric load of the bridge erecting machine, and in severe cases, causing the whole machine to overturn, which has a large potential safety hazard. For this reason, the present invention proposes a synchronous positioning structure and height adjustment method for adjusting the height of the legs of a bridge erecting machine to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a synchronous positioning structure and height adjustment method for adjusting the height of the legs of a bridge erecting machine to solve the problem that it is difficult to keep the lifting heights of the legs on both sides of the bridge erecting machine synchronized as proposed in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A synchronous positioning structure for adjusting the height of the legs of a bridge erecting machine, including: The main beam of the bridge erecting machine, at both ends of the lower surface of the main beam of the bridge erecting machine, leg sleeves are fixed. And at the lower end surface of the leg sleeve, pin holes are penetrated. The leg sleeve is a hollow structure, and a telescopic column adapted to it is movably inserted into the lower end cavity of the leg sleeve. A shielding frame is vertically slidably arranged on the outer side of the telescopic column, and the shielding frame is arranged in a "匚" shape with the opening facing downwards. Through holes one and two are respectively penetrated through the middle of the telescopic column and the middle of the shielding frame. A movable pulley fixedly connected to it is installed on the upper surface of the shielding frame; A winding roller, the winding roller is rotatably installed in the middle of the inner cavity of the main beam of the bridge erecting machine. A steel wire rope is wound around the outer side of the winding roller. One end of the steel wire rope is fixedly connected to the main beam of the bridge erecting machine. The middle part of the steel wire rope penetrates into the inner cavity of the leg sleeve, and the middle part of the steel wire rope is wound around the outer side of the movable pulley in a "U" shape.

[0007] Preferably, multiple through holes are provided for both through holes one and through holes two, and they are linearly distributed at equal intervals along the length direction of the telescopic column and the length direction of the shielding frame, respectively.

[0008] Preferably, the wire rope is provided in two sets, and is respectively inserted into the inner cavity of the two outrigger sleeves. Both sets of wire rope are wound around the outside of the winding roller and wound synchronously. Fixed pulleys are fixedly installed at both ends of the inner cavity of the main crossbeam of the bridge erecting machine, and the two wire ropes are respectively wound around the outside of the two fixed pulleys.

[0009] Preferably, guide grooves are provided on both sides of the telescopic column, and the two side plates of the shielding frame slide in the inner cavity of the two guide grooves respectively. A tension spring is provided between the upper inner wall of the shielding frame and the upper end face of the telescopic column, and the two ends of the tension spring are fixedly connected to the telescopic column and the shielding frame respectively.

[0010] Preferably, a limiting groove is formed at the lower end of the inner sidewall of the guide groove, and a limiting boss is fixed at the lower end of the shielding frame. The limiting boss is located in the inner cavity of the limiting groove, and the vertical height dimension of the limiting groove is greater than the vertical width dimension of the limiting boss.

[0011] Preferably, the pin cylinder is fixed on the cylinder frame, the cylinder frame is fixed on the surface of the outrigger sleeve, the pin cylinder is horizontally arranged, and the movable end of the pin cylinder is fixedly connected to a positioning pin, which is movably inserted into the inner cavity of the pin hole.

[0012] Preferably, a lifting cylinder parallel to the surface of the outrigger sleeve is fixedly installed on the surface of the outrigger sleeve, a protrusion is fixedly connected to the lower end of the telescopic column, and the movable end of the lifting cylinder is fixedly connected to the protrusion.

[0013] Preferably, the upper surface of the main crossbeam of the bridge erecting machine is provided with a strip-shaped hole that communicates with the inner cavity. One end of the wire rope passes through the strip-shaped hole and extends to the top of the main crossbeam of the bridge erecting machine. One end of the wire rope is fixed with a strip plate. The strip plate is perpendicular to the strip-shaped hole and is fixed to the upper surface of the main crossbeam of the bridge erecting machine by bolts.

[0014] Preferably, a winch is fixedly installed on the side of the main crossbeam of the bridge erecting machine, and the winch drives the winding roller to rotate.

[0015] A height adjustment method, employing the aforementioned synchronous positioning structure for adjusting the height of the bridge erecting machine's outriggers, specifically includes the following steps: Step 1: Start the winch so that the winding rollers simultaneously wind up the two wire ropes. The wire ropes pull the pulley and drive the shielding frame to move upward. The telescopic column remains in a fixed position due to the lifting cylinder. Therefore, the shielding frame slides upward relative to the telescopic column. Step 2: When the two telescopic columns are at the same height, the two shields move upward synchronously, and the second through hole and the first through hole correspond to each other. The positioning pin can pass through the pin hole, the second through hole and the first through hole in sequence, so that the telescopic column and the outrigger sleeve remain fixed. Step 3: When the two telescopic columns are not at the same height, the movable pulley on the outside of the telescopic column at the lower position is pulled upward by the steel wire rope, while the movable pulley on the outside of the telescopic column at the higher position is close to the telescopic column. Therefore, the through hole one on the telescopic column at the higher position will be misaligned with the through hole two on its outside, so that the positioning pin on its outside cannot be inserted into the cavity of through hole one. Step 4: Based on whether the horizontal sliding of the two positioning pins is blocked, the staff can determine whether the heights of the two telescopic columns are the same, and can also determine that the telescopic column where the horizontal sliding is blocked is located at a higher position. Step 5: Based on the judgment result of Step 4, adjust the extension and retraction of the lifting cylinder individually until the two extension columns are at the same height. Then, use the positioning pin to insert and position the extension column and the outrigger sleeve.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention features a winding roller rotatably installed inside the main crossbeam of a bridge erecting machine, with steel wire rope wound around its outer side. A shielding frame is slidably mounted on the outer side of the telescopic column, with a movable pulley fixed to its upper end. The telescopic column and the shielding frame each have a through hole (I and II). When the two telescopic columns extend or retract, the winding roller simultaneously winds up the two steel wire ropes and pulls the two shielding frames upwards. When the two telescopic columns are at the same height, the two shielding frames move upwards synchronously, ensuring that the two sets of through holes (I and II) completely align for the two positioning pins to pass through. When the two telescopic columns are at different heights, only one of the steel wire ropes will tighten and pull the shielding frame upwards, while the other shielding frame will not move. Therefore, the through hole (II) on the other shielding frame will be misaligned with the through hole (I), preventing the positioning pins from passing through. By checking whether the two positioning pins can pass through the two sets of through holes (I and II), the operator can determine whether the lifting height of the outriggers on both sides of the device is synchronized, thus preventing the device from tipping over. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the main crossbeam of the bridge erecting machine of the present invention; Figure 3 This is a schematic diagram of the steel wire rope structure arrangement of the present invention; Figure 4 This is a half-sectional schematic diagram of the telescopic column and shielding frame structure of the present invention; Figure 5 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 6 This is the telescopic schematic diagram of the two telescopic columns of the present invention.

[0018] In the figure: 1. Main cross beam of the bridge erecting machine; 11. Hoist; 12. Strip hole; 13. Fixed pulley; 2. Leg sleeve; 21. Lifting oil cylinder; 22. Pin hole; 3. Telescopic column; 31. First through hole; 32. Guide groove; 321. Limit groove; 33. Tension spring; 34. Convex block; 4. Shielding frame; 41. Second through hole; 42. Limit boss; 43. Movable pulley; 5. Pin cylinder; 51. Positioning pin; 52. Cylinder frame; 6. Winding roller; 61. Steel wire rope; 62. Strip board. Specific embodiments

[0019] In order to clearly and completely describe the purpose, technical solution of the present invention and make the advantages more clear, the following further details the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all the embodiments, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0020] Please refer to Figures 1 to 6 , the present invention provides a technical solution: Embodiment 1, a synchronous positioning structure for adjusting the leg height of a bridge erecting machine, including: the main cross beam 1 of the bridge erecting machine and the winding roller 6.

[0021] Specifically, at both ends of the lower surface of the main cross beam 1 of the bridge erecting machine, leg sleeves 2 are fixedly installed, and pin holes 22 are vertically penetrated through the lower end surface of the leg sleeves 2. The main cross beam 1 of the bridge erecting machine is horizontally arranged, and the leg sleeves 2 are vertically arranged. The leg sleeves 2 are hollow structures, and the lower end inner cavity of the leg sleeves 2 is movably inserted with telescopic columns 3 adapted thereto. The leg sleeves 2 and the telescopic columns 3 form telescopic legs for supporting the main cross beam 1 of the bridge erecting machine. The telescopic columns 3 can perform telescopic sliding in the vertical direction within the inner cavity of the leg sleeves 2, so as to adjust the overall height of the main cross beam 1 of the bridge erecting machine. A shielding frame 4 is vertically slidably arranged on the outer side of the telescopic column 3, and the shielding frame 4 is arranged in a "匚" shape with an opening downward. When the telescopic column 3 performs telescopic movement in the vertical direction, it can带动 the shielding frame 4 to move up and down synchronously, and the shielding frame 4 can also slide vertically on the outer side of the telescopic column 3 alone, so as to change the relative position with the telescopic column 3; Through holes 31 and 41 are respectively provided in the middle of the telescopic column 3 and the middle of the shield 4. Under normal conditions, the shield 4 moves down under the action of gravity, and the inner wall of the upper end of the shield 4 is in contact with the upper end surface of the telescopic column 3. At this time, through holes 31 and 41 are misaligned, and the subsequent positioning pin 51 cannot pass through through holes 31 and 41 at the same time. Only when the shield 4 slides up will through hole 41 correspond to through hole 31. At this time, the positioning pin 51 can pass through through holes 31 and 41 at the same time. In addition, a movable pulley 43 is installed on the upper surface of the shield 4 and is fixedly connected to it. The movable pulley 43 can move up and down synchronously with the shield 4 to change its own position. Secondly, the take-up roller 6 is rotatably installed in the middle of the inner cavity of the main crossbeam 1 of the bridge erecting machine. A steel wire rope 61 is wound around the outer side of the take-up roller 6. When the take-up roller 6 rotates, it can wind or unwind the steel wire rope 61. One end of the steel wire rope 61 is fixedly connected to the main crossbeam 1 of the bridge erecting machine, and the middle part of the steel wire rope 61 passes through the inner cavity of the outrigger sleeve 2. The middle part of the steel wire rope 61 is wound in a "U" shape around the outer side of the movable pulley 43. Figure 6 As shown, when the take-up roller 6 winds up the wire rope 61, the wire rope 61 is taut and pulls the movable pulley 43 upward, thereby driving the shielding frame 4 upward, so that the through hole 2 41 and the through hole 1 31 correspond to each other. When the take-up roller 6 unwinds the wire rope 61, the wire rope 61 is slack, and the movable pulley 43 and the shielding frame 4 automatically move downward under the action of gravity, so that the through hole 2 41 and the through hole 1 31 are misaligned. Since there are two sets of wire rope 61, which are respectively inserted into the inner cavity of the two support sleeves 2, and both sets of wire rope 61 are wound around the outside of the take-up roller 6 and wound up synchronously, therefore: ① when the height positions of the two telescopic columns 3 are the same, the height positions of the two shielding frames 4 are also the same. At this time, the two wire ropes 61 are wound up synchronously by the take-up roller 6, which can pull the two shielding frames 4 upward synchronously, so that the two through holes 1 31 and the two through holes 2 31 are misaligned. If the through hole 41 can be aligned, then the two positioning pins 51 can pass through the two sets of corresponding through holes 31 and 41 respectively to fix the telescopic column 3 and the outrigger sleeve 2; ② When the height positions of the two telescopic columns 3 are different, the height positions of the two shields 4 are also different. At this time, although the winding roller 6 winds up the two wire ropes 61 at the same time, one wire rope 61 is in a taut state and the other wire rope 61 is in a slack state. That is to say, only one shield 4 will be pulled up by one wire rope 61. Therefore, only one set of through holes 41 and 31 remains aligned, while the other set remains misaligned. Therefore, one of the two positioning pins 51 must be unable to pass through through holes 31 and 41. By checking whether the two positioning pins 51 can pass through through hole 31 and through hole 41, the staff can determine whether the extension lengths of the two telescopic columns 3 are the same, and thus determine whether the whole device is tilted, thereby reducing safety hazards.

[0022] To accommodate different degrees of extension and retraction of the telescopic column 3, multiple through holes 31 and 41 are provided in this application, and they are linearly distributed at equal intervals along the length of the telescopic column 3 and the length of the shield 4, respectively. By providing multiple through holes 31 and 41, it is possible to accommodate different degrees of extension and retraction of the telescopic column 3. That is to say, regardless of whether the extension and retraction length of the telescopic column 3 is large or small, there is always a set of through holes 31 and 41 that can correspond to the pin hole 22 for the insertion of the positioning pin 51.

[0023] To reverse the direction of the wire rope 61, this application further includes fixed pulleys 13 fixedly installed at both ends of the inner cavity of the main crossbeam 1 of the bridge erecting machine, with the two wire ropes 61 respectively wound around the outside of the two fixed pulleys 13, such as... Figure 6 As shown, the fixed pulley 13 is mainly used to reverse the direction of the wire rope 61, ensuring that the part of the wire rope 61 located in the inner cavity of the outrigger sleeve 2 can always maintain a "U" shape. In addition, since the wire rope 61 is wrapped around the outside of the movable pulley 43, the winding roller 6 only needs a small winding force to pull the shield 4 upward through the wire rope 61.

[0024] To guide the movement of the shielding frame 4, this application further includes guide grooves 32 on both sides of the telescopic column 3, with the two side plates of the shielding frame 4 sliding within the inner cavities of the two guide grooves 32 respectively. Figure 4 As shown, the side surfaces of the shielding frame 4 and the telescopic column 3 are flush. The shielding frame 4 and the telescopic column 3 can be located in the inner cavity of the outrigger sleeve 2 at the same time. The guide groove 32 can also guide the movement of the shielding frame 4, ensuring that the shielding frame 4 can only move up and down. In addition, a tension spring 33 is provided between the upper inner wall of the shielding frame 4 and the upper end face of the telescopic column 3. The two ends of the tension spring 33 are fixedly connected to the telescopic column 3 and the shielding frame 4 respectively. The tension spring 33 is used to pull the shielding frame 4 and the telescopic column 3 closer to each other. When the wire rope 61 is slack and does not provide an upward pulling force to the shielding frame 4, the shielding frame 4 can move down to fit with the telescopic column 3 under the dual action of its own weight and the pulling force of the tension spring 33, thereby avoiding the possibility that the shielding frame 4 is unable to move down due to insufficient weight.

[0025] To limit the vertical movement of the shielding frame 4, this application further includes a limiting groove 321 formed at the lower end of the inner wall of the guide groove 32, and a limiting boss 42 fixed at the lower end of the shielding frame 4. The limiting boss 42 is located within the cavity of the limiting groove 321, and the vertical height of the limiting groove 321 is greater than the vertical width of the limiting boss 42. Figure 4 As shown, the mutual cooperation between the limiting boss 42 and the limiting groove 321 can be used to limit the up and down movement of the shield 4. When the limiting boss 42 is located at the uppermost end of the inner cavity of the limiting groove 321, the second through hole 41 coincides with the first through hole 31. When the limiting boss 42 is located at the lowermost end of the inner cavity of the limiting groove 321, the second through hole 41 is misaligned with the first through hole 31.

[0026] To achieve relative fixation between the telescopic column 3 and the outrigger sleeve 2, the pin cylinder 5 of this application is fixed on the cylinder frame 52, which is fixed to the surface of the outrigger sleeve 2. The cylinder frame 52 is mainly used to install and position the pin cylinder 5. The pin cylinder 5 is horizontally positioned, and the movable end of the pin cylinder 5 is fixedly connected to a positioning pin 51. The positioning pin 51 is movably inserted into the inner cavity of the pin hole 22. When the telescopic column 3 is extended to the specified height position, the pin cylinder 5 is extended and the positioning pin 51 is moved horizontally, so that the positioning pin 51 passes through the inner cavity of the pin hole 22, the through hole 31, and the through hole 41, thereby achieving relative fixation between the telescopic column 3 and the outrigger sleeve 2, thus ensuring the overall stability of the device.

[0027] To provide power for the movement of the telescopic column 3, this application also includes a lifting cylinder 21 fixedly mounted parallel to the surface of the outrigger sleeve 2, a protrusion 34 fixedly connected to the lower end of the telescopic column 3, and a fixed connection between the movable end of the lifting cylinder 21 and the protrusion 34, such as... Figure 1 As shown, when the lifting cylinder 21 extends and retracts, it can be used to drive the telescopic column 3 to move up and down, thereby adjusting the overall height of the device. Then, the telescopic column 3 and the outrigger sleeve 2 are fixed by the positioning pin 51, which can reduce the force on the lifting cylinder 21 and prevent the overall height position of the device from being unstable due to insufficient oil pressure.

[0028] To fix the end of the wire rope 61 to the main crossbeam 1 of the bridge erecting machine, this application further includes a strip-shaped hole 12 penetrating the upper surface of the main crossbeam 1 of the bridge erecting machine and communicating with the inner cavity. One end of the wire rope 61 passes through the strip-shaped hole 12 and extends above the main crossbeam 1 of the bridge erecting machine. A strip plate 62 is fixed to one end of the wire rope 61. The strip plate 62 is perpendicular to the strip-shaped hole 12, and the strip plate 62 is fixed to the upper surface of the main crossbeam 1 of the bridge erecting machine by bolts. Figure 5 As shown, the strip plate 62 is mainly used to install and position the end of the wire rope 61 to prevent the end of the wire rope 61 from separating from the main crossbeam 1 of the bridge erecting machine.

[0029] In order to drive the winding roller 6 to rotate for winding or unwinding, this application also has a winch 11 fixedly installed on the side of the main crossbeam 1 of the bridge erecting machine. The winch 11 drives the winding roller 6 to rotate. The winch 11 is mainly used to provide power for the rotation of the winding roller 6, so as to ensure that the wire rope 61 can pull the shield 4 and the telescopic column 3 to move relative to each other.

[0030] This invention also discloses a height adjustment method, which uses the aforementioned synchronous positioning structure for adjusting the height of the bridge erecting machine's outriggers, specifically including the following steps: Step 1: Start the winch 11 so that the winding roller 6 can simultaneously wind up the two wire ropes 61. The wire ropes 61 pull the pulley 43 and drive the shielding frame 4 to move upward. The telescopic column 3 is affected by the lifting cylinder 21 and keeps its own position fixed. Therefore, the shielding frame 4 slides upward relative to the telescopic column 3. Step 2: When the two telescopic columns 3 are at the same height, the two shields 4 move up synchronously, and the through hole 2 41 and the through hole 1 31 coincide. The positioning pin 51 can pass through the pin hole 22, the through hole 2 41 and the through hole 1 31 in sequence, so that the telescopic column 3 and the outrigger sleeve 2 remain fixed. Step 3: When the heights of the two telescopic columns 3 are not the same, the movable pulley 43 on the outside of the telescopic column 3 at the lower position is pulled upward by the steel wire rope 61, while the movable pulley 43 on the outside of the telescopic column 3 at the higher position is in a state close to the telescopic column 3. Therefore, the through hole 1 31 on the telescopic column 3 at the higher position will be misaligned with the through hole 2 41 on its outside, so that the positioning pin 51 on its outside cannot be inserted into the cavity of the through hole 1 31. Step 4: Based on whether the horizontal sliding of the two positioning pins 51 is blocked, the staff can determine whether the heights of the two telescopic columns 3 are the same, and can also determine that the telescopic column 3 at the position where the horizontal sliding of the positioning pin 51 is blocked is at a higher position. Step 5: Based on the judgment result of Step 4, adjust the extension and retraction of the lifting cylinder 21 individually until the two telescopic columns 3 are at the same height. Then, use the positioning pin 51 to insert and position the telescopic column 3 and the outrigger sleeve 2.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A synchronous positioning structure for adjusting the height of the outriggers of a bridge erecting machine, characterized in that: Including: The main cross beam (1) of the bridge erecting machine, at both ends of the lower surface of the main cross beam (1) of the bridge erecting machine, leg sleeves (2) are fixed, and pin holes (22) are vertically penetrated and opened on the lower end surface of the leg sleeves (2). The leg sleeves (2) are of hollow structure, and a telescopic column (3) adapted thereto is movably inserted into the lower end inner cavity of the leg sleeves (2). A shielding frame (4) is vertically slidably arranged on the outer side of the telescopic column (3), and the shielding frame (4) is arranged in a "C" shape with an opening downward. Through holes one (31) and through holes two (41) are respectively vertically penetrated and opened in the middle of the telescopic column (3) and the middle of the shielding frame (4). A moving pulley (43) fixedly connected thereto is installed on the upper surface of the shielding frame (4); A winding roller (6), the winding roller (6) is rotatably installed in the middle of the inner cavity of the main cross beam (1) of the bridge erecting machine. A steel wire rope (61) is wound on the outer side of the winding roller (6). One end of the steel wire rope (61) is fixedly connected to the main cross beam (1) of the bridge erecting machine. The middle of the steel wire rope (61) penetrates into the inner cavity of the leg sleeve (2), and the middle of the steel wire rope (61) is wound in a "U" shape on the outer side of the moving pulley (43).

2. The synchronous positioning structure for adjusting the height of the outriggers of a bridge erecting machine according to claim 1, characterized in that: Both the through holes one (31) and the through holes two (41) are provided with a plurality of them, and are linearly distributed at equal intervals along the length direction of the telescopic column (3) and the length direction of the shielding frame (4) respectively.

3. The synchronous positioning structure for adjusting the height of the outriggers of a bridge erecting machine according to claim 2, characterized in that: Two groups of the steel wire ropes (61) are provided, and respectively penetrate into the inner cavities of two leg sleeves (2). The two groups of steel wire ropes (61) are both wound on the outer side of the winding roller (6) and are synchronously wound. Fixed pulleys (13) are fixedly installed at both ends of the inner cavity of the main cross beam (1) of the bridge erecting machine, and the two steel wire ropes (61) are respectively wound on the outer sides of the two fixed pulleys (13).

4. The synchronous positioning structure for adjusting the height of the outriggers of a bridge erecting machine according to claim 3, characterized in that: Guide grooves (32) are opened on both side surfaces of the telescopic column (3). The two side plates of the shielding frame (4) are respectively located and slid in the inner cavities of the two guide grooves (32). A tension spring (33) is arranged between the upper end inner wall of the shielding frame (4) and the upper end surface of the telescopic column (3), and both ends of the tension spring (33) are respectively fixedly connected to the telescopic column (3) and the shielding frame (4).

5. The synchronous positioning structure and height adjustment method for adjusting the height of the outriggers of a bridge erecting machine according to claim 4, characterized in that: A limiting groove (321) is opened at the lower end of the inner side wall of the guide groove (32). A limiting boss (42) is fixed at the lower end of the shielding frame (4). The limiting boss (42) is located in the inner cavity of the limiting groove (321), and the vertical height dimension of the limiting groove (321) is greater than the vertical width dimension of the limiting boss (42).

6. The synchronous positioning structure for adjusting the height of the outriggers of a bridge erecting machine according to claim 5, characterized in that: The pin cylinder (5) is fixed on a cylinder frame (52). The cylinder frame (52) is fixed on the surface of the leg sleeve (2). The pin cylinder (5) is horizontally arranged, and a positioning pin (51) is fixedly connected to the movable end of the pin cylinder (5). The positioning pin (51) is movably inserted into the inner cavity of the pin hole (22).

7. The synchronous positioning structure for adjusting the height of the outriggers of a bridge erecting machine according to claim 6, characterized in that: A lifting oil cylinder (21) parallel thereto is fixedly installed on the surface of the leg sleeve (2). A convex block (34) is fixedly connected to the lower end of the telescopic column (3). A fixed connection is made between the movable end of the lifting oil cylinder (21) and the convex block (34).

8. The synchronous positioning structure for adjusting the height of the outriggers of a bridge erecting machine according to claim 7, characterized in that: The upper surface of the main crossbeam (1) of the bridge erecting machine is provided with a strip hole (12) that communicates with the inner cavity. One end of the wire rope (61) passes through the strip hole (12) and extends to the top of the main crossbeam (1) of the bridge erecting machine. One end of the wire rope (61) is fixed with a strip plate (62). The strip plate (62) is perpendicular to the strip hole (12) and the strip plate (62) is fixed to the upper surface of the main crossbeam (1) of the bridge erecting machine by bolts.

9. A synchronous positioning structure for adjusting the height of the outriggers of a bridge erecting machine according to claim 8, characterized in that: A winch (11) is fixedly installed on the side of the main crossbeam (1) of the bridge erecting machine, and the winch (11) drives the winding roller (6) to rotate.

10. A height adjustment method, characterized in that: The synchronous positioning structure for adjusting the height of the bridge erecting machine legs as described in claim 9 specifically includes the following steps: Step 1: Start the winch (11) so that the winding roller (6) simultaneously winds up the two wire ropes (61). The wire ropes (61) pull the pulley (43) and drive the shield (4) to move upward. The telescopic column (3) remains in a fixed position due to the influence of the lifting cylinder (21). Therefore, the shield (4) slides upward relative to the telescopic column (3). Step 2: When the two telescopic columns (3) are at the same height, the two shields (4) move up synchronously, and the through hole 2 (41) and the through hole 1 (31) are aligned. The positioning pin (51) can pass through the pin hole (22), the through hole 2 (41) and the through hole 1 (31) in sequence, so that the telescopic column (3) and the outrigger sleeve (2) remain fixed. Step 3: When the heights of the two telescopic columns (3) are not consistent, the movable pulley (43) on the outside of the telescopic column (3) at the lower position is pulled upward by the steel wire rope (61), while the movable pulley (43) on the outside of the telescopic column (3) at the higher position is in a state close to the telescopic column (3). Therefore, the through hole one (31) on the telescopic column (3) at the higher position will be misaligned with the through hole two (41) on its outside, so that the positioning pin (51) on its outside cannot be inserted into the cavity of the through hole one (31). Step 4: Based on whether the horizontal sliding of the two positioning pins (51) is blocked, the staff can determine whether the height of the two telescopic columns (3) is consistent, and can also determine that the telescopic column (3) at the position where the horizontal sliding of the positioning pin (51) is blocked is at a higher position. Step 5: Based on the judgment result of Step 4, adjust the extension and retraction of the lifting cylinder (21) separately until the two extension columns (3) are at the same height position. Then, use the positioning pin (51) to insert and position the extension column (3) and the outrigger sleeve (2).

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